(banging my head against the wall) The strange results I got where cause by 16f874a and a 16f877 being wired in parallel! I seems they are both still operational, and with the 16f877 removed I can indeed read the ID values that uChip states. Wouter -- http://www.piclist.com hint: The PICList is archived three different ways. See http://www.piclist.com/#archives for details.